US1561326A - Rock drill - Google Patents

Description

L. A. HARRISON Nov. 10, 1925- ROCK DRILL Filed Oct. 24 1924 Patented Nov. 19, 1925.

UNITED STATES LUCIUS A. HARRISON, OF HESPERUS, COLORADO.

ROCK DRILL.

Application filed October 24, 1924. Serial No. 745,647.

To all whom it may concern:

Be it known that I, LUoIUs A. HARnIsoN, a citizen of the United States, residing at Hesperus, in the county of La Plata and State of Colorado, have invented certain new and useful Improvements in Rock Drills, of which the following is a specification.

The present invention appertains to a rock drill and has for its prime object to provide a drill which is simple and efficient in construction reliable, strong, durable and well adapted to the purpose for which it is designed.

A particular object of the invention is to provide a drill which in its operation will form a cone in the rock and then crush the cone so that the work may be accomplished more easily than with the ordinary drill now in use.

Vith the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing:

Figure 1 is an elevation of the drill bit embodying the features of my invention,

Figure 2 is another elevation thereof taken at right angles from that shown in Figure 1,

Figure 3 is an end elevation thereof, and

Figure 4 is another end elevation thereof.

Referring to the drawing in detail it will be seen that 1 designates the shank or body of the drill bit which is provided with a longitudinally extending bore indicated at 2 extending from end to end. The end 3 of the shank is the cutting end and the diameter thereof is greater than the other end. This end 3 is provided with the cutting blade as will be hereinafter more fully described.

In the present instance there are four cutting blades 5 arranged in pairs, those of one pair being indicated by the numerals 4 and those of the other pair by the numerals 5. The cutting blades 4 are provided with curved cutting edges indicated specifically at 6. These edges are not only curved longitudinally but also transversely as will be appreciated by referring to Figures 1 and 4. The under surfaces of the blades 4 are dished out as is indicated at 7 so as to be substantially concaved. The edges 6 are senn-clrcular in formation and the ends thereof terminate a distance from each other. Between the blades 4 and adjacent the ends formation which may be chucked up through the bore 2 if desired.

It is thought that the construction, advantages, and operation of this bit will now be clearly understood by those skilled in the art without a more detail description thereof. It is desired, however, that changes in the details of construction, material, and in the combination and arrangement of parts may be resorted to without departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any of its advantages. I

Having thus described my invention, what I claim as new is:

1. A drill bit of the class described including a shank having a pair of spaced and opposed outer blades and a pair of spaced inner blades disposed transversely of and connecting the end portions of the outer blades.

2. A drill bit of the class described including a shank having a pair of spaced and opposed outer blades and a pair of spaced inner blades disposed transversely of and connecting the end portions of the outer blades, said outer blades projecting below the inner blades.

3. A drill bit of the class described including a shank provided. at one end with a plurality of pairs of blades, a pair of said blades being curved throughout their lengths downwardly longitudinally and outwardly transversely, a second pair of said blades being spaced and disposed between and connecting the first pair of blades and extending at substantially right angles thereto.

In testimony whereof I aifix my signature. I

LUCIUS A. HARRISON.

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